He hasn't left yet, but he hasn't said anything about staying. I just feel like I'm waiting for the bomb to drop and my heart is breaking into pieces.[/QUOTE]

I've been there! The hardest thing to do is relax, calm down and not worry. Sounds like you are a lot of the control in the relationship and he has all of it.
Sounds to me like you could use some of it back. Have you considered how just this one aspect is effecting you? I know you are ready to explode probably and scrambling for something you can do to save it. Maybe the best thing to do is start looking at it from your angle and deciding that if he is in limbo still, what steps you might want to take. What kind of relationship is he providing for you currently? How much are you really able to give to a situation like that? You need to take care of you right now until he knows what he wants. No attitude, you can still say nice things, but at least this way you will take the edge off, release some of the pressure. Be kind and loving but assertive. Letting him know you are ready, willing and able and reassure him that youre life would be so much more with him in it than without. But you can take a small step back and give him space. Guys like that, they process quicker when they don't have to worry about hurting us in the process. But be firm and tell him what you expect. A timeframe maybe or more clarity at some point. Maybe set a check in time with him and let it go until then, just have fun and enjoy and be grateful for what is working in the relationship and in your life.

Btw, how long has he been undecided for?